No, it's a unique message body to every recipient...separate SMTP sessions for each recipient...it's a true newsletter subscription system.
you're doing this with Imail?
However, it is multi-threaded....usually runs about 10 simultaneous threads. Even at that, it's still 10 times faster on average than the benchmark of 10 seconds per. I think total message throughput answers the original question more completely.
10 seconds was rough estimate, but it's good enough. Here's a report for an bound gateway an at ISP:
Host/Domain Summary: Message Delivery (top 30)
sent cnt bytes defers avg dly max dly host/domain
-------- ------- ------- ------- ------- -----------
2129 54467k 0 1.5 s 1.7 m comcast.net
1394 25249k 0 1.5 s 52.0 s earthlink.net
1350 70502k 1 11.1 s 35.9 m aol.com
1111 20517k 39 23.6 s 12.2 h cox.net
797 36503k 1 2.6 s 1.0 m bellsouth.net
682 21493k 56 1.9 m 24.6 h sbcglobal.net
662 32848k 0 29.5 s 4.2 m hotmail.com
654 22466k 89 5.1 m 24.3 h yahoo.com
633 3774k 0 1.3 s 55.0 s dfwrealtors.com
490 7893k 0 2.4 s 56.0 s mindspring.com
438 11052k 0 29.3 s 3.1 m msn.com
423 2573k 0 9.8 s 2.6 m nc.rr.com
403 8944k 15 4.0 s 10.9 h onlymyemail.com
377 9944k 78 1.0 m 25.1 h verizon.net
335 322165 0 1.0 s 5.0 s surveyspot.com
282 8577k 0 4.2 s 56.0 s gmail.com
258 7673k 0 3.1 s 33.0 s adelphia.net
212 4156k 0 2.6 s 35.0 s optonline.net
189 4828k 0 3.0 s 1.5 m att.net
189 1169k 1 4.7 s 2.7 m gdar.org
181 9032k 0 49.1 s 1.4 m buyer-agent.net
181 8625k 0 6.7 s 53.0 s allyson.cncdsl.com
176 2275k 0 1.7 s 10.0 s mchsi.com
168 1968k 1 8.4 s 17.6 m worldnet.att.net
163 10866k 1 11.0 s 22.1 m realtracs.com
147 5017k 2 35.0 s 23.9 m tmo.blackberry.net
129 6708k 0 2.6 s 41.0 s kw.com
118 1255k 0 11.0 s 1.9 m cfl.rr.com
117 816k 0 2.6 s 38.0 s ctaz.comYou can see that the "average delivery" times PER DOMAIN are all over the place. The "avg dly" is the queue lifetime =
msg accepted via SMTP,
queued,
DNS lookup,
SMTP delivery,
and removal from disk queue.
There are almost no deferrals. In a list of 200k, with only 5% bad addresses (lots of deferrals) for a dirty list, the numbers would be totally different, much worse.
Also, the avg msg size above is about 3.5KB. Newsletters are often tarted up with tons of HTML, which typically increases a TXT msg size by 7 - 10 times.
But that is only for about 4000 deliveries/hour, such that the disk throughput (the usual limiting factor for a high-volume outbound gateway) is not a limit.
So 10 secs per msg is very reasonable as a rough estimate. You can drop to it 5, but why, when doing conservative rough estimates?
Len
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